LC
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52DH77E/RU/S
4 – 12
<During external connection> No picture on the monitor (2)
No picture appears on EXT1/EXT2 connected monitor during the DTV reception.
Is CVBS signal output into pin (19) of EXT1 (SC503) from pin
(67) of IC504 (TUNER OUT)?
YES
Check the setting of an external input device that connects with
EXT1.
Is CVBS signal output into pin (19) of EXT2 (SC502) from pin
(65) of IC508 (MONITOR OUT)?
YES
Check the setting of an external input device that connects with
EXT2.
NO
Is CVBS signal output into pin (1) of IC508 from pin (AJ24/
CVBS_MONI_OUT) of IC3302 (Digital AV decode & Main CPU)?
YES
Check the IC508 and their peripheral circuits.
NO
Is CVBS signal input to pin (6) of IC504 from pin (2) of
IC507 (MUX)?
YES
Check the IC504 and their peripheral circuits.
NO
Is TUNER_CVBS signal input to pin (4) of IC507 from
pin (AK24/CVBS_TU_OUT) of IC3302 (Digital AV
decode & Main CPU)?
YES
Check the IC507 and their peripheral circuits.
NO
Is IF signal sent to pins (AA29/D__IF_P, AB29/D__IF_N) of
IC3302 (Digital AV decode & Main CPU)?
YES
Check the IC3302 and their peripheral circuits.
NO
Is IF signal output from pins (16, 17) of TU1101?
YES
Check the line between TU1101 and IC3302.
NO
Whether the TUNER circuit operates correctly is checked.
<During external connection> No picture on the monitor (3)
No picture from EXT1 appears on EXT2-connected monitor.
Is CVBS signal output into pin (19) of EXT2 (SC502)?
YES
Check the setting of an external input device that connects with
EXT2.
NO
Is CVBS signal input to pin (1) of IC508 from pin (AJ24/
CVBS_MONI_OUT) of IC3302 (Digital AV decode & Main CPU)?
YES
Check the IC508 and their peripheral circuits.
NO
Is CVBS signal sent to pin (AG29/SC1_CVBS/Y) of IC3302 (Dig-
ital AV decode & Main CPU) from EXT1 (SC503)?
YES
Check the IC3302 and their peripheral circuits.
NO
Is CVBS signal sent to pin (20) of EXT1 (SC503)?
YES
Check the line between EXT1 (SC503) and IC3302.
NO
Check the setting of an external input device that connects with
EXT1.
Содержание LC-52DH77E/RU/S
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